{"id":27365,"date":"2024-03-17T09:26:49","date_gmt":"2024-03-17T00:26:49","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%aeifnull%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82\/"},"modified":"2024-03-22T16:02:58","modified_gmt":"2024-03-22T07:02:58","slug":"mysql%e3%81%aeifnull%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/mysql%e3%81%aeifnull%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e6%95%99%e3%81%88%e3%81%a6%e3%81%8f%e3%81%a0%e3%81%95%e3%81%84%e3%80%82\/","title":{"rendered":"MySql\u306eifnull\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002"},"content":{"rendered":"<p>MySQL\u3067\u3001IFNULL()\u95a2\u6570\u306f\u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304cNULL\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001NULL\u3067\u3042\u308c\u3070\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u30d5\u30a3\u30fc\u30eb\u30c9\u81ea\u4f53\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u306e\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>IFNULL(expr1, expr2)\r\n<\/code><\/pre>\n<p>expr1\u304c\u5224\u65ad\u3055\u308c\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u5f0f\u3067\u3042\u308a\u3001NULL\u306a\u3089expr2\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070expr1\u3092\u8fd4\u3059\u3002<\/p>\n<p>IFNULL()\u95a2\u6570\u3092\u4f7f\u7528\u3057\u305f\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\uff1a<\/p>\n<p>\u540d\u524d\u3068\u5e74\u9f62\u3092\u30af\u30a8\u30ea\u3057\u305f\u3044\u5834\u5408\u3001\u5e74\u9f62\u304cNULL\u306e\u5834\u5408\u306b\u306f&#8221;Unknown&#8221;\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u8fd4\u3059\u3001students\u3068\u3044\u3046\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>SELECT name, IFNULL(age, 'Unknown') AS age\r\nFROM students;\r\n<\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001age\u30d5\u30a3\u30fc\u30eb\u30c9\u304cNULL\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u305f\u3081\u306bIFNULL(age, &#8216;Unknown&#8217;)\u3092\u4f7f\u7528\u3057\u3001NULL\u306e\u5834\u5408\u306f&#8221;Unknown&#8221;\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306fage\u30d5\u30a3\u30fc\u30eb\u30c9\u81ea\u4f53\u3092\u8fd4\u3057\u307e\u3059\u3002\u6700\u7d42\u7684\u306a\u30af\u30a8\u30ea\u7d50\u679c\u306b\u306f\u3001\u751f\u5f92\u306e\u540d\u524d\u3068\u5e74\u9f62\u304c\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n<p>\u9858\u308f\u304f\u306f\u3042\u306a\u305f\u306b\u5f79\u7acb\u3061\u307e\u3059\u3088\u3046\u306b\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u3067\u3001IFNULL()\u95a2\u6570\u306f\u7279\u5b9a\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u304cNULL\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u3001NULL\u3067\u3042\u308c\u3070\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u8fd4\u3057\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u30d5\u30a3\u30fc\u30eb\u30c9\u81ea\u4f53\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u306e\u69cb\u6587\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 IFNULL(expr1, expr [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-27365","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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